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  #11  
Old 08-06-2015, 11:52 AM
GTWreck GTWreck is offline
 
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Location: Locust Grove, GA
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Your GAMI spread of 0.6 is kinda high. I had a similar problem with my #5 and #6 being too hot. I recently posted my solution to this: http://www.vansairforce.com/communit...d.php?t=127460

In the end, my GAMI spread was 0.1, and I have no more temp issues.
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  #12  
Old 08-06-2015, 12:11 PM
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Lenny Iszak Lenny Iszak is offline
 
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Those GAMI spread lines are kind of arbitrarily placed by the software. Look at the chart instead. To me it looks like it peaks at 13.5 or so.
I'd do a couple more runs to confirm though, level 24/24, stop every .2gph for a few seconds for the numbers to settle.

You have about the same CHT delta when LOP. So it may still be a cooling airflow issue.

Lenny
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  #13  
Old 08-06-2015, 12:35 PM
60av8tor 60av8tor is offline
 
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Quote:
Originally Posted by J Twilbeck View Post
So, I've been flying for a few months now
Holy cow, congrats Justin! Did I miss first flight announcement here? I just checked out your blog - plane looks fantastic!! I will PM with a question about your interior lighting as not to totally derail this post

Big congrats on a flying -10!
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  #14  
Old 08-06-2015, 12:52 PM
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J Twilbeck J Twilbeck is offline
 
Join Date: Oct 2012
Location: Huntsville AL
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Quote:
Originally Posted by 60av8tor View Post
Holy cow, congrats Justin! Did I miss first flight announcement here? I just checked out your blog - plane looks fantastic!! I will PM with a question about your interior lighting as not to totally derail this post

Big congrats on a flying -10!
Thanks, no you didn't miss the announcement I just haven't posted it yet....
But thanks for the compliment.
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  #15  
Old 08-06-2015, 03:48 PM
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Bill.Peyton Bill.Peyton is offline
 
Join Date: Sep 2009
Location: St. Louis, MO
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Justin,
A couple of observations and questions

I consider anything over 400 degrees too hot with the acceptation of a short blip. During the summer, I can not climb full throttle to altitude without one of the cylinders going above 400. I find that climbing out at 125kts seems to be the best speed for cooling and reducing the power once over 2000 AGL. Maintaining 24/2500 produces CHTs in the 350-380 range depending on the OAT. I never lean on climb out to less than the takeoff EGT.

When you are on the ground and the engine is cool, does the CHT read the same as the OAT? How many hours do you have on your engine? It seems that mine took around 15- 20 hours before the CHTs dropped and stabilized. To me it looks like you have a problem with all the CHTs being way to high, but #6 does seem way out of line. FYI, my #6 is one of the coolest cylinders. The oil cooler damper position has little affect for me.

Is this a new Lycoming factory engine? Do you have your wheel pants and fairings installed. Installing them and increasing your airspeed will increase your cooling. I would still check for an intake leak and make sure that your baffle seals around the rear and lower portion of the #5 and #6 cylinders are tight up against the cylinder. I would also check your timing advance. I just looked at your Blog and see you have dual electronic ignition.
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Last edited by Bill.Peyton : 08-06-2015 at 03:50 PM.
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  #16  
Old 08-06-2015, 04:06 PM
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1001001 1001001 is offline
 
Join Date: Dec 2014
Location: Just Minutes from KBVI!
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Quote:
Originally Posted by J Twilbeck View Post
Thanks, no you didn't miss the announcement I just haven't posted it yet....
But thanks for the compliment.
Congratulations! It looks great! I have been following your blog but for some reason (browser cache?) your updates haven't shown up for me. I just upgraded my phone which cleared my cache and allowed me to see everything past "We got a hangar" for the first time today.

Anyway, once again congratulations!
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  #17  
Old 08-06-2015, 07:33 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
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It appears to me you may be leaning to rapidly to get good data. Note how some CHT's appear to be still rising until :18.5 when there was a sudden drop of 1 gal/hr in FF. (If CHT's are rising you must still be ROP).

Electronic ignition? Something else to look at. Even a few extra degrees of advance can significantly increase CHTs. Any chance #6 could be timed differently than the others?

Maybe trouble shoot at lower power settings. I wouldn't run a cylinder at 440 no matter where Lycoming puts the red line.
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